BTLA	B- and T-lymphocyte attenuator
CD137	cluster of differentiation 137/tumor necrosis factor receptor superfamily member 9 (TNFRSF9)
CRT	chemoradiotherapy
DOAJ	Directory of open access journal
GITR	glucocorticoid-induced TNFR-related
HNSCC	head and neck squamous cell carcinoma
IL-2	interleukin 2
LAG3	lymphocyte-activation gene 3
mAb	monoclonal antibody
MDPI	Multidisciplinary Digital Publishing Institute
MTX	methotrexate
OX40	tumor necrosis factor receptor superfamily member 4 (TNFRSF4)
PBL	peripheral blood lymphocytes
PD-1	programmed cell death protein 1
PD-L1	programmed cell death-ligand 1
SEB	Staphylococcus enterotoxin b
TIL	Tumor-infiltrating lymphocytes
TIM3	t-cell immunoglobulin and mucin-domain containing-3
Treg	regulatory T cells
TLA	Three letter acronym
5-FU	5-fluorouracil